Centrifugal, turbine, and similar pump.



G. SULZER. CENTRIIUGAL, TURBINE, AND SIMILAR PUMP. APPLICATION FILED MAR.28, 1910.

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Patented Nov. 24, 1914.

UNITED sTATEs PATENT oEEicE.

GEORG- SULZER, 0F HARRISON, NEW JERSEY, ASSIGNOR T0 HENRY R. WORTHINGTON, OF NEW YORK, N. Y., .A CORPORATION OF NEW JERSEY.

CENTRIFUGAL, TURBINE, ANI) SIMILAR PUMP.

Specification of Letters Patent.

Patented Nov. 24, 1914.

y Application filed March 28, 1910. Serial No. 551,963.

T0 all whom it may concern Be it known that I, GEORG.y SuLzEn, a citizen of Switzerland, residing at Harrison, county of Hudson, and State of New Jersey, have invented certain new and useful Improvements in Centrifugal, Turbine, and Similar Pumps, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates especially to centrifugal or turbine pumps of that class having a plurality of double suction impellers operating in series, the main object of the invention being to provide such a multistage pump of simple and cheap construction and high efficiency.

The invention is especially intended for pumps having small impellers, so that the latter can be run at a very high rate of speed, as, for instance, when the impellers are directly connected to a steam turbine or other high speed motor, but may be used with impellers of anysize.

The invention consists in various features of construction and combination of parts, as fully described and particularly claimed hereinafter.

In the accompanying drawings forming part of this specification the invention is shown as applied in its preferred form in connection with a multi-stage pump having two impellers, from which the application of the invention with any number of impellers may be understood.

In the drawings Figure l is a vertical, central section of the pump. Fig. 2 is a vertical section on the line 2 of Fig. 1. Fig. 3 is a detail section on the line 3 of Fig. 2.

Referring to the drawings, A is the suction head casing, B the delivery head casing, C the intermediate casing, D the suction, E the delivery, F a shaft carrying the two .impellers G and G2. and H the diffusion rings outside the impellers having the diffusion vanes a between which the fluid passes from the impellers. The intermediate casing section C has an interior wall 10 separated .from the outer casing wall 11 to form an annular passage through which the liquid passes from the firstimpeller to the second impeller, which passage is divided by stationary vanes 7J preferably extending from the ends of the diffusion vanes a substantially toA thefsuction of .thesecond impeller,

as shown, these vanes b connecting the outer and lnner, casing walls 10, 11, and these walls and vanes preferablyV being formed integral, so that the intermediate section is a single casting. It willbe understood that any number of intermediate casings C may be inserted between the suction and delivery heads A, B, depending upon the number of impellers in the pump. v

The impellers` G, G2 are shown as of quite small diameter, so that they may be run very fast withoutexcessive peripheral speed, and for the purpose of securing a large capacity and balancing the impellers, they are made o f the double-suction type, that is, with suctions at opposite sides. The supply of liquid to the suctions on the rear sides of the impellers is secured by suction chambers formed between the casing walls and opposite sides of the diffusion rings and the passage of the liquid from the front side cham# berto the rear side chamber through openings l formed through the diffusion vanes a, so that the liquid thus passes freely by large and quite directpassages from the front side of the impeller to the suction on the rear side of the impeller. Stationary guide vanes c are preferably used in these chambers. With these openings through the diffusion vanes, no joint should be formed through which the higher-pressure liquid in the diffusion passages between the vanes a may leak to the lower-pressure liquid in the openings through the diffusion vanes,

ythese respective pressures being obviously the impeller deliveryppressure and suction pressure. that the diffusion vanes shall be integral with the opposite side Walls of the diffusion passages throughout openings 1, and in order to secure this result and at the same time provide for convenient finishing of the inner points of the diffusion vanes and for convenient substitution of diffusion rings lof different diameters, the construction shown is used.

In this construction the side wall 13. forming one side of the diffusion ring and formed integral with the diffusion vanes` extends in- Ward throughout the full depth of the diffusion vanes a and is provided with an inwardly extending ring or flange Q which incloses the-sideof the impeller and forms the running ioint with the impeller. On

.theoppesite-sideofthe diffusion ring, a wall For this purpose it is important l (lil 3 integral with the'vanes entends inward` over the vanes a only to a line inside the openings l so that the didusion passages are closed by this wall throughout the depth of the openings l, but the inner ends or points of the vanes a are left exposed on one side A of the ring 4for convenient inishing. The diusion ring is completed and the running joint on the wall 3 side of the impeller formed by the ring la, corresponding to the wall 13 on the opposite side of the di'usion ring, which ring 1d is recessed to set over the w'all 3 and close the diffusion passages at the inner ends of the diffusion vanes, this ring ld having the inwardly extending ring or flange 4: corresponding in construction and function to the ring or Harige 2 on wall 13.

lThe walls 13, 14 of the diffusion ring are providedvwith shoulders 5 adapted to seat in recesses in the casing, and the complete ring is preferably held in place and secured to the casing by bolts 6 passing through the side walls and didusion vanes near their periphery and into the casing, the loosening of these bolts being prevented by their setting into recesses in the casing, as shown in Fig. 3. This construction avoids the dillicult operation of making the diffusion rings and casing so accurately as to secure the tight lit necessary tohold the diffusion rings properly in place solely by the pressure between the parts of the assembled casing.

It will be seen that the construction shown is very simple and cheap, providing for the convenient assemblage of the parts with the numberY of impellers desired, and securing a large delivery with small impellers and high eiciency by the use of the double-suction impellers with proper suction supply passages and protection against leakage. lmpellers of different sizes may readily be used with the same casing parts,

it being necessary in changing impellers only to insert different diffusion rings, so as to properly make the joint between the casing and the impellers. While the construction is especially intended for multistage pumps the invention includes certain features which may be used in single-stage pumps.

lt will be understood that the invention is not limited to the exact form or arrangement of parts shown, but that modifications may be made therein while retaining the in- `vention defined by the claims.

What l claim is l. ln a multistage centrifugal or similar pump, the combination with the shaft and a plurality of impellers having suction openings on opposite sides and partitions between the impellers, of diitusion rings surrounding said inipellers, said diffusion rings being independent of the pump casing and pump partitions, said dih'usion rings havraient/o ing inward extensions on both sides of the impellers forming the `impeller side chainbers and running joints with the impellers.

2., ln a centrifugal or similar` pump, the combination with an impeller, of a diffusion ring surrounding said impeller and having an inward extension forming a running joint with the impeller, said didusion ring being mounted in the pump casing and su ported thereby only on a diameter greater t 1an the outer diameter of the impeller.

3. ln a centrifugal or similar pump, the combination with an impeller, of a diffusion ring surrounding said impeller and having an inward extension forming a running joint with the impeller, said diffusion ring being mounted in and supported by the casing at itsperiphery, whereby an open space is left on each side of the didusion ring.

4. lin a centrifugal or similar'pu'nip, the combination with a pump casing having an interior recess, of an impeller, and a didnsion ring separate from the casing and surrounding the ilnpeller, said did'usion ring being seated at its periphery in the recess in the casing and having an inward extension forming a running joint with the impeller.

5. In a multistage centrifugal pump, the combination with a shaft and a plurality of impellers therein, of a pump casing having interior recesses, partitions forming passages between the respective impellers, and diffusion rings separate from the pump casing and partitions and extending inward to the impeller suction and forming running joints with the impellers, said didusion rings being seated at their peripheries in the recesses in the casing.

6. ln a centrifugal or similar pump, the combination with an impeller having suction openings on opposite sides, of a diffusion ring surrounding said impeller and having its side walls extended inward to inclose the impeller and form running joints therewith, and separate casing members on opposite sides of the diffusion ring between which the didusion ring is mounted and supported at its periphery.

Bti

7. ln a centrifugal or similar pump, the

combinationwith an impeller having suction openings on opposite sides, of a didusion ring surrounding said impeller and having its side walls extended inward to inclose the impeller and form running joints therewith, casing walls between which the diffusion ring is mounted arranged to forni suction chambers between the walls and opposite sides of the diflusion ring, and passages through the didusion ring connecting said suction chambers. i

8. lin a centrifugal or similar pump, the combination with an impeller having suction openings on. opposite sides, of a difusion ring surrounding said impeller, casing walls between which saiddilusion' ring is mounted arranged to form suction chambers on opposite sides of the diusion ring, and passages through the diffusion ring connecting said suction chambers, said diifusion ring having one entire side wall integral with the vanes and on the opposite side a narrower wall integral with the vanes and extending inward beyond said passages hut not to the inner ends of the vanes, and a separate ring completing with said narrow wall the side wall of the diffusion ring.

9. In a multi-stage centrifugal or similar pump, the combination with a shaft and a plurality of impellers thereon having suction openings on opposite sides, of diffusion rings surrounding said'- impellers and having suction passages through the diffusion vanes, suction and delivery head casings, and one or more intermediate casings having inner and outer walls forming annular passages connecting the successive impellers,

said diifusion rings being mounted between said casings and having inward extensions inclosing the impellers and forming running joints therewith, the casings and diffusion rings being arranged to form suction chambers on opposite sides of the impellers connected by the passages through the diffusion vanes. Y

10. A diffusion ring for centrifugal and similar pumps having the diiusion vanes a forming the diffusion passages, side wall 13 on one side extending the full depth of the vanes, narrow wall 3 on the opposite side of the diffusion ring formed integral with the vanes and wall 13 and having passages 1 eX- tending through the vanes and of less depth than the narrow wall 3.

11. A diffusion ring for centrifugal and similar pumps having the diffusion vanes a forming the diffusion passages, side wall 13 on one side extending the full depth of the vanes, narrow wall 3 on the opposite side of the diffusion ring formed integral with the vanes and wall 13 and having passages 1 extending through the vanes and of less depth than the narrow wall 3, and separate lside wall 14 closing the inner portions of the diffusion passages.

12. A diusion ring for centrifugal and similar pumps having the diffusion vanes a forming the diffusion passages, side Wall 13 on one side extending the full depth of the vanes, narrow wall 3 on the opposite side of the diffusion ring formed integral with the vanes and Wall 13, and having passagesl eX- tending through the vanes and of less depth than the narrow wall 3, and separate side wall 14 closing the inner portions of the diffusion passages, said side walls 13, 14 having the inward extensions 2, 4, to inclose the impeller and form running oints therewith.

13. -The combination with a pump casing having recess 5, of an impeller, and a diffusion ring surrounding the impeller and seated in said recess, said diffusion ring being supported by the casing only in said recess and extending inward to the impeller suction and forming a running joint with the impeller.

14. The combination with the pump casing and partitions 10, and a plurality of-double suction impellers, of diffusion rings i mounted at their peripheries in said casing i and partitions, and having inward extensions forming impeller side chambers and running joints with the impellers, said diffusion rings and extensions being separated from said casing and partitions to form water chambers on each side of the diffusion rings.

15. The combination with the pump casing and partitions 10, and a plurality of my hand, in the presence of two subscribing witnesses.

- GEORG SULZER. Witnesses:

J. A.. GRAVES, W. H. KENNEDY. 

